Appendix A - Specifications [UE9 Datasheet] | LabJack

# Appendix A - Specifications [UE9 Datasheet]

Specifications at 25 degrees C and Vusb/Vext = 5.0V, except where noted.

Table A-1. Specifications

### Looking at the Differential

Looking at the Differential Linearity Error, how does "number of counts" translate into voltage error?  Do we assume the Vref of the ADC is 5V?  If so, for a 12-bit ADC, then one LSB = one count = Vref/2^N =5/4096 = 1.22mV.  So that's the DNL.  The INL error is 0.02% of FS = 0.0002*5=1mV.  Do those two errors simply add up to give 2.22mV of total non-linearity error?

Thanks for the help.

### Wiki has general info about

Wiki has general info about DNL and INL.  To translate counts into voltage, it depends on the range.  If you are using the 0-5 volt range, then your calculation for the weight of 1 12-bit count is correct.

You should not have to add DNL and INL.  INL should include DNL.  I think the fact that DNL actually looks slight bigger than INL for a 12-bit G=1 measurement is just the limitation of a 12-bit measurement.  Both errors together are within 1 count, so we can't look closer to separate them.

Absolute Accuracy includes DNL and INL and other error sources.